#!/bin/bash
date
mkdir -p /tmp/dn_stu
cd /tmp/dn_stu
mkdir -p /tmp/dn_stu/eric
mkdir -p /tmp/dn_stu/ben
mkdir -p /tmp/dn_stu/cici
mkdir -p /tmp/dn_stu/e0_23
touch dn_01 dn_02 dn_eric e_01 f3_python
echo '---------------------------------'
ls [eb]*  
echo '---------------------------------'
ls [a-z][0-9]*
